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Postretirement Plans - Additional Information (Detail) - USD ($) | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | ---
Dec. 30, 2017 | Oct. 07, 2017 | Dec. 31, 2016 | Oct. 08, 2016 | Jul. 16, 2016 | Jul. 15, 2017 | Dec. 29, 2018 | Dec. 30, 2017 | Dec. 31, 2016 | Jan. 02, 2016 | Dec. 31, 2017
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement loss | $ (1,619,000) | $ (3,030,000) | $ (173,000) | $ (1,832,000) | $ (4,641,000) | $ 0 |  | $ (4,649,000) | $ (6,646,000) |  |
Expected pension income for fiscal 2018 | $ 1,700,000 |  |  |  |  |  |  | $ 1,700,000 |  |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  |  | 8.00% |  |  |
Percentage of total plan assets | 100.00% |  | 100.00% |  |  |  |  | 100.00% | 100.00% |  |
Expected company contribution | $ 680,000 |  |  |  |  |  |  | $ 680,000 |  |  |
Postretirement Benefits, minimum years of service for eligibility |  |  |  |  |  |  |  | 10 years |  |  |
Postretirement Benefits, minimum age for eligibility |  |  |  |  |  |  |  | 55 years |  |  |
Expense under plans |  |  |  |  |  |  |  | $ (897,000) | $ 2,238,000 | $ (5,878,000) |
Contribution of pension fund in excess of total contribution |  |  |  |  |  |  |  | 5.00% | 5.00% | 5.00% |
Multiemployer plans, minimum contribution | 0 |  |  |  |  |  |  | $ 0 |  |  |
Multiemployer plan, withdrawal obligation | 15,223,000 | $ 15,200,000 |  |  |  |  |  | 15,223,000 |  |  |
Multiemployer plans transition payments payable | 3,100,000 |  |  |  |  |  |  | $ 3,100,000 |  |  |
Multiemployer plans payable date |  |  |  |  |  |  |  | Nov. 03, 2017 |  |  |
Multiemployer plan withdrawal liability of net present value monthly payments period |  | 20 years |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retiree medical coverage provided |  |  |  |  |  |  |  | 3 years |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Retiree medical coverage provided |  |  |  |  |  |  |  | 5 years |  |  |
Common Stock |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Defined benefit plan equity securities included in common stock |  |  | 2,030,363 |  |  |  |  |  | 2,030,363 |  | 2,030,363
Equity securities, amount |  |  | $ 40,500,000 |  |  |  |  |  | $ 40,500,000 |  | $ 39,200,000
Percentage of total plan assets |  |  | 12.10% |  |  |  |  |  | 12.10% |  | 11.50%
Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  | 6.40% |  |  |  |
Pension plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Settlement loss |  |  |  |  |  |  |  | $ (4,649,000) | $ (6,646,000) |  |
Actual return on plan assets |  |  |  |  |  |  |  | 42,076,000 | $ 4,689,000 | $ 6,900,000 |
Amortization from accumulated other comprehensive income into net periodic cost (benefit) | 6,100,000 |  |  |  |  |  |  | $ 6,100,000 |  |  |
Expected long-term rate of return on plan assets |  |  |  |  |  |  |  | 8.00% | 8.00% | 8.00% |
Contribution of company to company pension plans |  |  |  |  |  |  |  | $ 1,891,000 | $ 1,341,000 | $ 10,436,000 |
Pension plans | Required |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  | 286,000 | 341,000 | 436,000 |
Pension plans | Discretionary |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  | $ 1,605,000 | 1,000,000 | 10,000,000 |
Last Fifteen Years |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Average annual return on the plan assets |  |  |  |  |  |  |  | 8.50% |  |  |
Non Qualified Pension Plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected company contribution | 300,000 |  |  |  |  |  |  | $ 300,000 |  |  |
Non Qualified Pension Plans | Required |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  | 300,000 |  |  |
Qualified Pension Plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expected company contribution | 0 |  |  |  |  |  |  | 0 |  |  |
Qualified Pension Plans | Discretionary |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  | 1,600,000 |  |  |
Qualified Pension Plans | Scenario, Forecast |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Voluntarily contributions made by an employer |  |  |  |  |  |  | $ 10,000,000 |  |  |  |
Postretirement Benefit Plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Amortization from accumulated other comprehensive income into net periodic cost (benefit) | (600,000) |  |  |  |  |  |  | (600,000) |  |  |
Contribution of company to company pension plans |  |  |  |  |  |  |  | 376,000 | 841,000 |  |
Expected company contribution | 700,000 |  |  |  |  |  |  | 700,000 |  |  |
Contributions by participants | $ 300,000 |  |  |  |  |  |  | 330,000 | 284,000 | 200,000 |
Multiemployer Plans |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Expense under plans |  |  |  |  |  |  |  | $ 2,100,000 | $ 2,200,000 | $ 2,100,000 |
Red Zone |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  |  |  |  |  | Less than 65 percent |  |  |
Yellow Zone |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  |  |  |  |  | Between 65 and less than 80 percent |  |  |
Green Zone |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Percentage of funded under multi employer plans |  |  |  |  |  |  |  | At least 80 percent |  |  |
Qualified Pension Plan |  |  |  |  |  |  |  |  |  |  |
Pension and Other Postretirement Benefits Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |  |
Voluntarily contributions made by an employer |  |  |  |  |  |  |  | $ 1,600,000 |  |  |

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- Definition Percentage of fair value of investments (categorized by debt securities, equity securities, real estate and other plan assets) to the fair value of plan assets held. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 5 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e2446-114920 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 715 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (d)(1) -URI http://asc.fasb.org/extlink&oid=82843861&loc=d3e1928-114920 + Details
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